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Factual error: In the scene where they are watching "The Drive", the TV is not showing an NFL game at all. The field is 110 yards long. There is an overhead shot of the field and you can see two 50 yard lines and a C in the middle. They are watching a CFL game.

Factual error: In the scene where they bet on the outcome of "The Drive" AFC Championship game, it's obviously late evening. Yet, the Browns/Broncos game was started at 12:30 EST, so it would have been morning in Colorado (where the movie takes place).

Plot hole: The movie is based in 1986 after the group time travels from 2010. That makes it a 24 year trip back in time. It is stated that Jacob is 20 years old. That is an error as this would make him roughly around 23 or 24 if he was conceived in 1986, which we saw near the end of the movie.

Continuity mistake: When the guys reach the end of their downhill run, they encounter Blain, who is irked by their "shenanigans," going so far as to shove Jacob to the ground. When he pushes Jacob the large two-way radio that is in his pocket falls and hits the ground in front of him. However, when the camera angle changes to show only Blain and Chaz, the radio is back in his pocket without him ever having to recover it from the ground.

Plot hole: In the scene when the guys bet on the outcome of the football game, their prediction is proven wrong when the vomit covered squirrel from the earlier scene runs onto the field and disrupts John Elway's pass. The movie takes place in Colorado, but the AFC Championship game featuring "The Drive" was played in Cleveland, OH. That's a lot of distance for a squirrel to travel in a couple hours.

Suggested correction:The movie is a comedy. Sure it's unlikely for a squirrel to travel that distance in the given time, but so is a time machine in the form of a hot tub. The scene is there to demonstrate the effects of altering the future, not to prove how fast a squirrel can be. In a comedy, this is exactly the kind of liberties one might expect from a scriptwriter.

Revealing mistake: The can of "Chernobly" is supposed to be from Moscow, and the lettering on the can contains at least one Cyrillic letter. However, the name printed on the can is nonsensical, using random Latin and Cyrillic letters in an effort to look Russian, but the letters don't spell a word and means nothing in Russian.

Plot hole: Sure, they say you should never question time-travel logic in a comedy movie. But when the friends that decided to get in the hot tub at the end return to the present, their future has changed. However, Lou acts like he hasn't seen them since then. This obviously cannot be: if they weren't there up until the point they returned, they wouldn't have had any of the things they returned to. Sure, they changed the future through their actions, but they'd need to be there for the next 20 years in order to maintain those changes. And they couldn't have existed, and replaced their present selves when they returned, as their present selves wouldn't have gone to the Kodiak Club anyway, since Lou wouldn't have tried to kill himself, so their present selves wouldn't have gotten into the time machine in the first place. Deep.

Continuity mistake: When the movie starts, Nick has his left hand over the bulldog's back and the right around the leash. When the phone rings, his left hand is now holding the leash, and the right one is grabbing the cell phone. The transition between both movements is missing.

When the foursome ski down the mountain and are looking around at the oddly dressed people, someone behind John Cusack says, "Hey Lane, you owe me two dollars". This was a nudge to John Cusack, who played Lane Meyers in "Better Off Dead" and was pursued in the snow by a crazed paper boy shouting "Two dollars!"